Switching between 2 K type pyrometer probes with one meter.

I have a pyrometer that accommodates 1 type k probe. I would like to add a second probe by having a switch to go from one to the other.

Is it sufficient to have a single pole double throw switch to change the connection for one of the probe leads (while the other one remains continuously connected) or do I need to use a double pole double throw switch to change the connection for both leads simultaneously.

If accuracy matters to you, it also needs to be a switch made for actual thermocouple switching. So for Type K use, the metals in the switch need to be Chromel / Alumel compatible. (and get the right wire to the right metal ;)src="http://ceramicartsda...ault/wink.gif"> on the switch) Copper components don't "cut it".

Otherwise you create secondary thermocouples (two joined dis-similar metals) at the junctions between the thermocouple extension wire (which ALSO needs to be the correct stuff) and the switch. As the temperature in the area of the SWITCH changes,.... you create another set of electromotive forces...... and this impacts the reading that you will get on the meter.

Gold and silver contacts on the good qulaity types of switches minimize this issue.....but make them pricey.

Doc Wwhen you are ready to get new burners heres a place I have been dealing direct with for 30 plus years on small cheaper venturi burners.Gas appliance Cophone# 951 940- 5252

They sell small MR 75,000 and MR 100,000 btu burnersThey are on several kilns I operate.Mark

It's my understanding that I would have to do a major overhaul of the manifold to accommodate these burners. Is that true?

That may be true-I do not know what it looks like exactly-the small burners are about 7 1/2 -8 inches long-New manifold is not that much to re-plumb if it fixes the kiln. I run 8 of the small ones on a 35 cubic foot car kiln so 4 would be plenty -if not overkill.Mark